There are a number of natural herbs and remedies which have been scientifically proven to help reduce the symptoms of benign prostatic hyperplasia.
Benign Prostatic Hyperplasia(BPH) refers to a non-malignant enlargement of the prostate, which can lead to obstructive and irritative lower urinary tract symptoms (LUTS).
Herbal medicines such as Nettle root, Pygeum africanum and Beta-Sitosterol have been used in many studies to treat prostate disease, and desirable results have been achieved in this regard.
In no particular order, let me share three of the best evidence-based natural remedies for treating benign prostatic hyperplasia(BPH).
1. Stinging Nettle Root
One of the most commonly used and studied herbal remedies for treating BPH is nettle root.
Stinging nettle root has a variety of therapeutic benefits such as anti-inflammatory, anti-tumor and antiviral effects, modulating of the immune system, and relieves the symptoms of benign prostatic hyperplasia due to the compounds it contains such as phytosterols, lignans and polysaccharides
A double-blind placebo-controlled study published in 2013 investigating the efficacy of nettle on the reduction of clinical symptoms of BPH concluded:
In three clinical trials on BPH patients, nettle had a better impact in reducing patients’ clinical symptoms than placebo.
According to the results, nettle had a better effect in relieving clinical symptoms in BPH patients compared to placebo.
As a whole, nettle is recommended to be used more in the treatment of BPH patients, given its beneficial effects in reducing BPH patients’ symptoms and its safety in terms of its side effects and its being better accepted on the side of patients. 
2. Pygeum Africanum Bark Extract
Next up we have the extract of the African prune tree, Pygeum africanum, which is another promising herbal remedy for naturally treating BPH.
A review study published in 2002 investigating the evidence of whether extracts of Pygeum africanum were more effective than placebo in the treatment of BPH found:
Compared to men receiving placebo, Pygeum africanum provided a moderately large improvement in the combined outcome of urologic symptoms and flow measures as assessed by an effect size defined by the difference of the mean change for each outcome divided by the pooled standard deviation for each outcome (-0.8 SD [95% confidence interval (CI), -1.4, -0.3 (n=6 studies)]).
Men using Pygeum africanum were more than twice as likely to report an improvement in overall symptoms (RR=2.1, 95% CI = 1.4, 3.1). Nocturia was reduced by 19%, residual urine volume by 24% and peak urine flow was increased by 23%.
A standardized preparation of Pygeum africanum may be a useful treatment option for men with lower urinary symptoms consistent with benign prostatic hyperplasia.
However, the reviewed studies were small in size, were of short duration, used varied doses and preparations and rarely reported outcomes using standardized validated measures of efficacy.
Additional placebo-controlled trials are needed as well as studies that compare Pygeum africanum to active controls that have been convincingly demonstrated to have beneficial effects on lower urinary tract symptoms related to BPH.
These trials should be of sufficient size and duration to detect important differences in clinically relevant endpoints and use standardized urologic symptom scale scores. 
Last up we have Beta-Sitosterol, a natural substance found in many plant-foods such as fruits, vegetables, nuts and seeds.
A systematic review published in 2000 aimed to assess the effects of beta-sitosterols (B-sitosterol) on urinary symptoms and flow measures in men with of benign prostatic hyperplasia (BPH).
The result from the study found:
519 men from 4 randomized, placebo-controlled, double-blind trials, (lasting 4 to 26 weeks) were assessed.
3 trials used non-glucosidic B-sitosterols and one utilized a preparation that contained 100% B-sitosteryl-B-D-glucoside.
B-Sitosterols improved urinary symptom scores and flow measures. The weighted mean difference (WMD) for the IPSS was -4.9 IPSS points (95%CI = -6.3 to -3.5, n = 2 studies). The WMD for peak urine flow was 3.91 ml/sec (95%CI = 0.91 to 6.90, n = 4 studies) and the WMD for residual volume was -28.62 ml (95%CI = -41. 42 to -15.83, n = 4 studies).
The trial using 100% B-sitosteryl-B-D-glucoside (WA184) show improvement in urinary flow measures. B-sitosterols did not reduce prostate size. Withdrawal rates for men assigned to B-sitosterol and placebo were 7.8% and 8. 0%, respectively.
The evidence suggests non-glucosidic B-sitosterols improve urinary symptoms and flow measures. Their long term effectiveness, safety and ability to prevent BPH complications are not known. 
 The Efficacy of Stinging Nettle (Urtica Dioica) in Patients with Benign Prostatic Hyperplasia: A Randomized Double-Blind Study in 100 Patients
 Pygeum africanum for benign prostatic hyperplasia.
 Beta-sitosterols for benign prostatic hyperplasia.
The information in this article has not been evaluated by the FDA and should not be used to diagnose, cure or treat any disease, implied or otherwise.